斜谷道 / Xiegu Road (late Han)
斜谷道 / Xiegu Road enters the wiki through Hanji 959 as the route 刘焉’s Yizhou side blocks after taking Hanzhong. The episode identifies Xiegu around the Qinling route system near Mei County, with the south mouth called Bao and the north mouth called Xie, hence the Baoxie route name.
In the source, the road is not background geography. It connects the 关中 plain with the Hanzhong, Ba, and Shu route field, so controlling it helps Liu Yan claim that “rice-bandits” have cut communications while also making that separation materially real.
The page therefore anchors 兵家必争通道控制. Xiegu is important because it combines route value, military movement, and political communication: once blocked, the court’s connection to 益州 becomes weaker both in fact and in Liu Yan’s public explanation.